Vanilla Bean Cookie Bars

INGREDIENTS

1 cup

unsalted butter, softened (2 sticks)

1/2 tsp

salt

3/4 cup

powdered sugar

the seeds scraped from one vanilla bean

egg yolks

2 1/4 cups

all-purpose flour

1/2 cup

unsalted butter, softened (1 stick)

3 cups

powdered sugar

1/3 cup

milk

the seeds scraped from one vanilla bean

1 tsp

pure vanilla extract

gel food coloring (optional)

sprinkles (optional)